Is this true or false

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Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

Segment ab is shown on the graph. which shows how to find the x-coordinate of the point that will divide ab into a 2: 3 ratio using the formula